Abstract. Robust and accurate dynamic stall modeling remains one of the most
difficult tasks in wind turbine load calculations despite its long research
effort in the past. In the present paper, a new second-order dynamic stall
model is developed with the main aim to model the higher harmonics of the
vortex shedding while retaining its robustness for various flow conditions
and airfoils. Comprehensive investigations and tests are performed at
various flow conditions. The occurring physical characteristics for each
case are discussed and evaluated in the present studies. The improved model
is also tested on four different airfoils with different relative
thicknesses. The validation against measurement data demonstrates that the
improved model is able to reproduce the dynamic polar accurately without
airfoil-specific parameter calibration for each investigated flow condition
and airfoil. This can deliver further benefits to industrial applications
where experimental/reference data for calibrating the model are not always
available.
Improved dynamic stall prediction of wind turbine airfoils
